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利用ZMLMC定向凝固装置，研究了Al2O3／Al—4．5Cu金属基复合材料在不同凝固冷却速率条件下的显微组织和合金元素分布的变化，实验结果表明：当凝固速度v=16．7μm／s时，Al2O3／Al—45Cu复合材料基体组织为胞状晶，胞状晶中无颗粒存在；当v=49.8μm／s时，基体为树枝状晶，颗粒在枝品中均匀分布，一、二次枝晶间距随着凝固速度的提高而减小Cu元素在Al2O3／Al—45Cu复合材料的液／固界面前沿的分布状况随着生长速率的增大呈现规则性的变化.
The microstructure and alloying element distribution of Al2O3 / Al-4.5Cu metal matrix composites under different solidification and cooling rates were studied by using ZMLMC directional solidification apparatus. The experimental results show that when the solidification rate v = 16.7μm / s, the matrix of Al 2 O 3 / Al-45Cu composites was cellular crystal, and no particles existed in the cellular crystal. When v = 49.8μm / s, the matrix was dendritic and the particles were uniformly distributed in the branches. The dendritic spacing decreases with the increase of solidification rate. The distribution of Cu at the liquid / solid interface frontier of Al2O3 / Al-45Cu composites changes regularly with the growth rate.